Positive electrode active material for lithium secondary battery, method of preparing the same and lithium secondary battery including the same
US-2017309910-A1 · Oct 26, 2017 · US
Method for manufacturing positive electrode active material, and secondary battery
US2021020935A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2021020935-A1 |
| Application number | US-202017036611-A |
| Country | US |
| Kind code | A1 |
| Filing date | Sep 29, 2020 |
| Priority date | Jun 26, 2017 |
| Publication date | Jan 21, 2021 |
| Grant date | — |
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- Title
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Abstract
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A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, are less likely to be changed by charging and discharging as compared with those of a known positive electrode active material. In order to form the positive electrode active material having the pseudo-spinel crystal structure in the charged state, it is preferable that a halogen source such as a fluorine and a magnesium source be mixed with particles of a composite oxide containing lithium, a transition metal, and oxygen, which is synthesized in advance, and then the mixture be heated at an appropriate temperature for an appropriate time.
First claim
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1 . A lithium-ion secondary battery comprising: a positive electrode active material, wherein the positive electrode active material comprises a path through which lithium is inserted and extracted in a region from a surface to a depth of 10 nm, and wherein the positive electrode active material is configured to inhibit dissolution of transition metal from the positive electrode active material. 2 . A lithium-ion secondary battery comprising: a positive electrode active material comprising lithium, cobalt, and oxygen, wherein the positive electrode active material comprises a path through which lithium is inserted and extracted in a region from a surface to a depth of 10 nm, and wherein the positive electrode active material is configured to inhibit dissolution of the cobalt from the positive electrode active material. 3 . A lithium-ion secondary battery comprising: a positive electrode active material comprising lithium cobalt oxide, wherein the positive electrode active material comprises a path through which lithium is inserted and extracted in a region from a surface to a depth of 10 nm, and wherein the positive electrode active material is configured to inhibit dissolution of the cobalt from the positive electrode active material.
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Classifications
- C01G51/82Primary
Compounds containing cobalt, with or without oxygen or hydrogen, and containing two or more other elements · CPC title
of inorganic oxides or hydroxides · CPC title
of elements or alloys · CPC title
Selection of substances as active materials, active masses, active liquids · CPC title
Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries · CPC title
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- What does patent US2021020935A1 cover?
- A positive electrode active material has a small difference in a crystal structure between the charged state and the discharged state. For example, the crystal structure and volume of the positive electrode active material, which has a layered rock-salt crystal structure in the discharged state and a pseudo-spinel crystal structure in the charged state at a high voltage of approximately 4.6 V, …
- Who is the assignee on this patent?
- Semiconductor Energy Lab
- What technology area does this patent fall under?
- Primary CPC classification C01G51/82. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Thu Jan 21 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).